I have heard that timing belts can develop a hard spot over time and can make noise when it passes over the pulleys. If so it should be replaced.
NO! Unlike tires timing belts do not develop an out of round or hard spot condition as they become worn. The belt tensioner can develop problems with the spring or bearing which can cause an annoying engine noise, but unlike tires the only way you know a timing belt is do for replacement is to keep track of the mileage and or years it's in use. A perfectly quiet and normal looking timing belt can strip out suddenly without any warning!
NO! Unlike tires timing belts do not develop an out of round or hard spot condition as they become worn. The belt tensioner can develop problems with the spring or bearing which can cause an annoying engine noise, but unlike tires the only way you know a timing belt is do for replacement is to keep track of the mileage and or years it's in use. A perfectly quiet and normal looking timing belt can strip out suddenly without any warning!
